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<title>Problem 1640. -- [Usaco2007 Nov]Best Cow Line -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>1640: [Usaco2007 Nov]Best Cow Line</h2><span class=green>Time Limit: </span>5 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>64 MB<br><span class=green>Submit: </span>240&nbsp;&nbsp;<span class=green>Solved: </span>119<br>[<a href='submitpage.php?id=1640'>Submit</a>][<a href='problemstatus.php?id=1640'>Status</a>][<a href='bbs.php?id=1640'>Discuss</a>]</center><h2>Description</h2><div class=content>FJ打算带着他可爱的N (1 ≤ N ≤ 2,000)头奶牛去参加”年度最佳老农”的比赛.在比赛中,每个农夫把他的奶牛排成一列,然后准备经过评委检验. 

比赛中简单地将奶牛的名字缩写为其头字母(the initial letter of every cow),举个例子,FJ带了Bessie, Sylvia,和Dora,那么就可以缩写为BSD. 

FJ只需将奶牛的一个序列重新排列,然后参加比赛.他可以让序列中的第一头奶牛,或者最后一头走出来,站到新队列的队尾. 

利欲熏心的FJ为了取得冠军,他就必须使新队列的字典序尽量小. 

给你初始奶牛序列(用头字母)表示,然后按照上述的规则组成新序列,并使新序列的字典序尽量小. 
</div><h2>Input</h2><div class=content>第1行:一个整数N. 
第2行至第N+1行:每行一个大写字母,表示初始序列中该奶牛的头字母. 
</div><h2>Output</h2><div class=content>得到的最小字典序的序列.每输出80个字母需要一个换行! 
</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>6<br />
A<br />
C<br />
D<br />
B<br />
C<br />
B<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata><br />
ABCBCD<br />
</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=Silver'>Silver</a></p></div><center>[<a href='submitpage.php?id=1640'>Submit</a>][<a href='problemstatus.php?id=1640'>Status</a>][<a href='bbs.php?id=1640'>Discuss</a>]</center>﻿<br>

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